Exotic Nd 4f electron magnetism in Nd2RhSi3

TL;DR

This study investigates the magnetic and electronic properties of Nd2RhSi3, revealing ferromagnetic order at 16.5 K, spin-glass features at higher temperatures, and the influence of Nd 4f hybridization changes due to Rh 4d on its complex magnetism.

Contribution

It provides new insights into the effects of Rh substitution on Nd2PdSi3, highlighting altered magnetic behavior and hybridization effects in this compound.

Findings

Ferromagnetic ordering at 16.5 K observed.

Spin-glass features appear at higher temperatures.

Changes in Nd 4f hybridization influence magnetic properties.

Abstract

The compound, Nd2PdSi3, belonging to R2PdSi3 family (R = rare-earths) has been known to exhibit exotic behavior due to unusual Nd 4f hybridization. Here, we study the electronic properties of Nd2RhSi3 employing ac and dc magnetization, heat-capacity, electrical resistivity and magnetoresistance measurements, as Nd 4f hybridization is expected to be slightly different due to the changes in the 4d element. The experimental results establish that, like the Pd analogue, this compound also exhibits ferromagnetic ordering at a rather high temperature of 16.5 K, unlike many other rare-earth members of this family which are antiferromagnetic, with a complex magnetism at further lower temperatures (less than 10 K). There are differences in the measured properties with respect to the Pd analogue, the most important one being the observation of spin-glass features at a temperature significantly higher than the Curie temperature. This is attributed to a gradual evolution of cluster magnetism with decreasing temperature. We infer that the changes in Nd 4f hybridization due to Rh 4d (instead of Pd 4d) plays a role in some fashion for such differences. These properties are attributed to the competing magnetic ground states due to geometrical frustration arising out of triangular arrangement of Nd ions with a bond disorder.